First, Thanks to Trevor and Peter for responding.
Here's waht I have on the reclassification:

In 1993 Ash et al. proposed that members of "group 3" within the genus ¤
Bacillus should be transferred to the genus Paenibacillus, for which they
proposed ¤ Paenibacillus polymyxa as the type species. These proposals
were validly published by publication in the Validation Lists No. 51
(Paenibacillus polymyxa) and No. 52 (further species) in 1994 and 1995
respectively.

http://www.bacterio.cict.fr/p/paenibacillus.html

This bacterium, formerly named Bacillus larvae, was reclassified into the
new genus Paenibacillus (5) on the basis of the 16S rRNA sequence
diversity. The P. larvae strains are divided into two distinct subspecies,
P. larvae subsp. larvae and P. larvae subsp. pulvifaciens (14). Although
P. larvae subsp. larvae is considered to be the cause of American
foulbrood, P. larvae subsp. pulvifaciens is capable of causing similar but
usually milder clinical symptoms.

http://aem.asm.org/cgi/content/full/69/3/1504

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